book Maths Puzzle Numerical Ability

Find a6 for an=8(1/2)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me.

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book Other Question

Solve for x: 6^x = 492. The second of three numbers is 8 more than the first, and the third number is 3 less than 3 times the first. If the third number is 15 more than the second, find the three numbers.